Brake-applying connection



Sept. 14 1926.

A. Y. DODGE BRAKE APPLYING commc'rxou Filed May 22, 1926 INVENTOR AmELY. DODGE BY .v hw

ATTORNE Patented Sept. 14, 1926.-

I UNITED STATES FATE ,aai

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ADIEL Y. DODGE, OF SOUTH BEND, INDIANA, ASSIGNOR T BEHDIE'. BRAKE COMPANY,

OF CHICAGO, ILLINOIS; A CORPORATION OF ILLINOIS.

BRAKE-APPLYING CONNECTION.

Application filed Kay 3'3, 19%. ficrial No. 110,844.

This invention relates to brakes, and is illustrated as embodied in an automobile chassis having brakes on all four wheels. An object of the invention is to balance the 6 forces acting on the brake-applying crossshaft, to neutralize any tendency to deflect the shaft, thus permitting a lighter shaft to be used.

In one desirable arrangement the shaft operates one pair of brakes, and an arm on the shaft is connected at its end to the pedal or the like, while at an intermediate point it is connected to the other pair of brakes in a novel manner such that the forces act: ing. on the shaft neutralize each other, and there is no tendency to deflect the shaft.

The above and other objects and features of the invention, including. various novel combinations and arrangements of the parts will be apparent from the following des' cription of one illustrative embodiment shown in the accompanying drawing, in which:

Fig. 1 is a perspective view of part of an automobile chassis;

Fig. 2 is a perspective from a different point of view and on a larger scale of the above-described arm on the shaft; and i Fig. 3 is a diagram showing the arm on the shaft in side elevation, and indicating how the arrangement to balance the forces is calculated.

In the arrangement selected for illustration, the chassis includes front wheels 10 having brakes 12- operated by connections ltfrom arms 16 projecting down wardly. from a shaft 18, and rear wheels 20 having brakes 22 operated b connections 24 from arms 26 on a she t 28; All

lent to arm 34, to balance the bending forces acting on shaf Of any force from the pedal, indicat d by the vector A,

four of the brakes are to be opet'ated by a certain amount goes to the rear brakes, the balance acting on shaft 18 to apply the front brakes and causing a force li tending tobend shaft 18 forwardly. The division of the force between front and rear brakes varies, and the various leverages in the hookup vary, so that there is no necessary general relation between A and B,

but with any given hookup their relation is fixed so that they may be regarded as known quantities. The length L of arm 34 is also a known quantity. Now if X be the distance from the connection 36 to the end of the effective lever arm G, in order that the force on link 36 shall balance the bending. force 3 on shaft '18, length X is determined by the formula:

ass mx ITT i That is, A -B (the force at the upper end of arm 3% acting on the rear brakes) is to till, bending force B (which equals the force 34 as a lever fulcrumed on link 36, and

pulled forwardly at its upper end by a force '(A B) acting to apply the rear brakes,

and tending to rock the lower end of arm 34 rearwardly about fulcrum 36 with a force which we wish to equal B. Now the force A-B at the upper end of the lever, multiplied by the ratio 5 of the two arms of the lever, gives this balancing force, which we equate against B thus:

While one illustrative embodiment has been described in detail, itis not my intention to limit the scope of the. invention,

to that particular embodiment, or other-' one pair of brakes and having an oper ating arm secul'ed thereto and projecting therefrom, a device eonnecting the end of the arm to the pedal and extending forward- 1y from the shaft, and another device extending rearwardly from the shaft and operatmg the other pair of brakes and connected to the arm between the first device and the axis of the shaft, and in which the length X betw%n the eonnections of the two devices to the arm is determined by the following formula, in which A de notes the force applied to the end of the arm from the pedal, B denotes the force tending to bend the shaft due to the force acting to apply the front brakes, and C denotes the effective length of the arm, the formula being:

T X n In testimony whereof, I have hereunto signed my name;

'ADIEL Y. nonen. 

